GPIO module and SubDummy tests

[kevincyap]

No description provided.

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (01a96df) 70.52% compared to head (54e2603) 93.70%.

Files	Patch %	Lines
rtl/ahb/devices/SubDummy.sv	97.43%	1 Missing ⚠️
rtl/apb/devices/GPIO/GPIO.sv	95.65%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #22       +/-   ##
===========================================
+ Coverage   70.52%   93.70%   +23.17%     
===========================================
  Files           3        4        +1     
  Lines          95      127       +32     
===========================================
+ Hits           67      119       +52     
+ Misses         28        8       -20     

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[rishyak]

Good job getting the coverage back up. Take a look at the codecov warnings at your convenience and then merge once they're sorted.